Fd-format was : " A DOS tool written in Pascal by Christoph H. Hochstätter that allows users to format floppy disks to a higher than usual density, enabling the user to store up to 300 kilobytes more data on a normal high density 3.5" floppy disk" (wikipedia). It is not related with linux's fdformat command.
I used to use it on my 286 machine with 5.25 floppy back in 90s.

altheos wrote:Fd-format was : " A DOS tool written in Pascal by Christoph H. Hochstätter that allows users to format floppy disks to a higher than usual density, enabling the user to store up to 300 kilobytes more data on a normal high density 3.5" floppy disk" (wikipedia). It is not related with linux's fdformat command.
I used to use it on my 286 machine with 5.25 floppy back in 90s.

You don't need to. Just look under image information in WinImage. In fact, we can safely assume it's two sides and with 512-byte sectors, so all we need to know is sectors per track and the image's size in bytes, then the rest can be calculated.

OK. The specs on real hardware are : 82 tracks, 18 sectors/tracks, 2 sides, 512 bytes. Total space : 1494528 bytes. Total : 1511424 bytes. I could not find tracks and sectors details in winimage
It's the max that fdformat can do on 5.25 floppy.